If you have a vision problem that requires corrective
These types of sunglasses also can help you if you need reading glasses only or if you wear contact lenses to correct only your distance vision and still need that additional boost for reading. The polarized prescription sunglasses are very helpful.
Light reflected from surfaces like a flat road or smooth water is generally horizontally polarized. To block this horizontal glare, scientists developed a lens with vertically oriented polarizer. , which will block the horizontally polarized light. The result is the polarized prescription sunglasses: it reduces that annoying and sometimes dangerous glare, and makes your eyes feel comfortable and you can see better.
The lenses of the polarized ones are made in a synthetic plastic. The filter is made of a material whose molecules align vertically. They are good not only for anti-glare purpose but also for general trendy wear. The frames of them are also in a wide range. You can get those made with metal, plastic, titanium or other kinds of materials. They have their own benefits.
The prices of authentic polarized prescription sunglasses are much higher than the ordinary ones. A genuine polarized lens can be tested by rotating it in a particular direction and seeing if the glare through the lens changes in its intensity on rotation. A fake sunglass may in fact damage eyesight. So when you go to optical stores for them, you should distinguish them carefully.